From 7ae4c39fc6898665b1d7fc4dfb4142f82336ac07 Mon Sep 17 00:00:00 2001 From: Nate Begeman Date: Tue, 23 Nov 2004 21:34:18 +0000 Subject: [PATCH] Save/Restore arg regs and nonvolatile regs the compiler might use during CompilationCallback llvm-svn: 18175 --- lib/Target/PowerPC/PPC32JITInfo.cpp | 41 ++++++++++++++++++++--------- 1 file changed, 29 insertions(+), 12 deletions(-) diff --git a/lib/Target/PowerPC/PPC32JITInfo.cpp b/lib/Target/PowerPC/PPC32JITInfo.cpp index 60b264064ee..6bc74b229ae 100644 --- a/lib/Target/PowerPC/PPC32JITInfo.cpp +++ b/lib/Target/PowerPC/PPC32JITInfo.cpp @@ -48,10 +48,22 @@ static void EmitBranchToAt(void *At, void *To, bool isCall) { } static void CompilationCallback() { - // FIXME: Should save R3-R10 and F1-F13 onto the stack, just like the Sparc - // version does. - //int IntRegs[8]; - //uint64_t FPRegs[13]; + // Save R3-R31, since we want to restore arguments and nonvolatile regs used + // by the compiler. We also save and restore the FP regs, although this is + // probably just paranoia (gcc is unlikely to emit code that uses them for + // for this function. +#if defined(__POWERPC__) || defined (__ppc__) || defined(_POWER) + unsigned IntRegs[29]; + double FPRegs[13]; + __asm__ __volatile__ ( + "stmw r3, 0(%0)\n" + "stfd f1, 0(%1)\n" "stfd f2, 8(%1)\n" "stfd f3, 16(%1)\n" + "stfd f4, 24(%1)\n" "stfd f5, 32(%1)\n" "stfd f6, 40(%1)\n" + "stfd f7, 48(%1)\n" "stfd f8, 56(%1)\n" "stfd f9, 64(%1)\n" + "stfd f10, 72(%1)\n" "stfd f11, 80(%1)\n" "stfd f12, 88(%1)\n" + "stfd f13, 96(%1)\n" :: "r" (IntRegs), "r" (FPRegs) ); +#endif + unsigned *CameFromStub = (unsigned*)__builtin_return_address(0); unsigned *CameFromOrig = (unsigned*)__builtin_return_address(1); unsigned *CCStackPtr = (unsigned*)__builtin_frame_address(0); @@ -95,16 +107,21 @@ static void CompilationCallback() { CCStackPtr[2] = (intptr_t)CameFromStub; CCStackPtr[1] = (intptr_t)CameFromOrig; - // FIXME: Need to restore the registers from IntRegs/FPRegs. - // Note, this is not a standard epilog! #if defined(__POWERPC__) || defined (__ppc__) || defined(_POWER) - __asm__ __volatile__ ("lwz r0,4(r1)\n" // Get CameFromOrig (LR into stub) - "mtlr r0\n" // Put it in the LR register - "lwz r0,8(r1)\n" // Get "CameFromStub" - "mtctr r0\n" // Put it into the CTR register - "lwz r1,0(r1)\n" // Pop two frames off - "bctr\n" ::); // Return to stub! + __asm__ __volatile__ ( + "lfd f1, 0(%0)\n" "lfd f2, 8(%0)\n" "lfd f3, 16(%0)\n" + "lfd f4, 24(%0)\n" "lfd f5, 32(%0)\n" "lfd f6, 40(%0)\n" + "lfd f7, 48(%0)\n" "lfd f8, 56(%0)\n" "lfd f9, 64(%0)\n" + "lfd f10, 72(%0)\n" "lfd f11, 80(%0)\n" "lfd f12, 88(%0)\n" + "lfd f13, 96(%0)\n" "lmw r3, 0(%1)\n" + "lwz r0,4(r1)\n" // Get CameFromOrig (LR into stub) + "mtlr r0\n" // Put it in the LR register + "lwz r0,8(r1)\n" // Get "CameFromStub" + "mtctr r0\n" // Put it into the CTR register + "lwz r1,0(r1)\n" // Pop two frames off + "bctr\n" :: // Return to stub! + "r" (FPRegs), "r" (IntRegs)); #endif }